Drill.



H. K. PARSONS.

DRILL.

APPLICATION FILED JULY 5,1916.

1,246,005. Patented Nov. 6,1917.

2 SHEETS-SHEET I.

Q l? I INVENTOR HaroIdKPansoJzs BY I M40914, A TTOR/VE Y5 -H. K.PARSONS.

7 DRILL. I APPLICATION FILED JULY 5,1916.

1,246,005. Patented Nov. 6, 1917.

2 SHEETS -SHEET 2.

MMMW

liaroIdKParsons and regulating the in drills,

,edge of the lens,

' include the provision STATES PATENT OFFICE. v

HAROL D K. PARSONS, OF SOUTHBRIDGE, MASSACHUSETTS.

DRILL.

To all whom it may concern.

Be it known that I, HAROLD K. Parsons, a citizen of the UnitedStates,residing at Southbridge, in the county of Worcester and State ofMassachusetts, have invented certain new and useful Improvements inDrills, of which the following is a specification. 7 1

This invention relates to improvements and has particular reference toan improved construction of drill particularly adapted for use inconnectionwith opthaL" mic lenses.

The leading object of the present invention i s-the provision in a lensdrill of'improved means for accuratelydetermining exact points on a lensall", which the drilling operation will take p ace. v

A further object of the invention is the elimination of the commonlyused stop engagingthe edge of the lens to j be drilled j and thereplacement of this form of stop with an improved positioning andindicating member which may be readily adjusted to control the depth ofdrilling from the which will indicate the exact position at which thedrilling will take place and which will form a support for the lens atthe exact point where it is to be drilled irrespective of the adjustmentof the lens or other parts of the machine.

Other objects of the present invention of an improved type of lensholding carriage, or improved means for facilitating drilling of thelens at decentered points or points above or below the geometrical axisof the lens, and in general the simplification andincreasing of thegfliciency of the several parts of a lens rill.

Figure I reprrsents a perspective view of a complete drill constructedin accordance with, and embodying the generic principles of myinvention. 7

Fig. II represents a fragmentary plan view of the lens holding carriageand drill indicator and stop device.

Fig. III represents a central vertical sectional View of my improvedconstruction.

Fig. IV represents a perspective view of the carriage support orbedplate.

Specification of Letters Patent.

Application filed July 5, 1916. Serial No. 107,585.

Patented No 6; 1917.

F ig. V represents tive view illustrating my improved. decenteringmeans. 7

Fig. VI represents a transversed sectional ew centrally of the partsshown in Fig. V, and V Fig. VII represents a fragmentary perspectiveview illustrating an adjustable or wear-compensating stop device androller for engagement therewith. l

a fragmentary perspeca In the drawings, in which similar'charac- I tersof reference are employed to denote corresponding parts throughout theseveral views, the numeral 1 designates the base of my drill, havingrising therefrom the customary standard 2, provided with the bearings 3and 4 for the drill-spindle 5, adapted' to be moved toward the work asby the handlefi, and driven through the medium of a belt passing aroundthedrive pulley 7 and idlers 8, these-parts being of any usual andordinary construction as 'may be de sired. p 7 p r In that form of. myinvention illustrated in Figs; I and III for example, I have shown aspivotally secured in the base 1, the depending lug 9 of the lens holderbase 10, connected with the main base of the frame as by the screw 11and Washer 12, to permit of pivotal movement of the carriage base asdesired, an indicator plate 13,

secured to one side of-themember 10, co-

operating with the dial or scale 14 to denote the effect of pivotaladjustment of the said member 10. e v

This base 10 has rising therefrom, the car 15 spanned by the pair ofears'ld'on the yoke 17, the ears '15'and 16 being pivotall connected asby the bolt 18. This yoke 1 terminates in the pair of enlargements 19and 20,:adapted-to receive and form pivotal bearings for the spindles ortrunnions21 on the bed plate 22. It will beinoted that the enlargementorbearing is-split and provided with the clamp screw; 23, adapted to drawthe portions of the split together to .lock the inclosed trunnion andthus the bed In that;form 'of theinvention illustrated in Figs-I an'd'IVfor. example. I have shown the bedplate22 as formed with the Tshaped orundercut groove or guide way 23', in which is slidably mounted thedepending T shaped rib 24 of the lens carriage 25, which bears at itsforward end the pair of lens positioning pins 26 adapted to engage theforward edge of the lens. A supplemental clamp slide 27 embracing thecarriage 25 bears a second pair of pins 28 adapted to engage the rearedge of the lens to automatically center the same in correct position onthe lens carriage, as would be best understood by reference to Figs. 1and Ill. Springs 29 are preferably connected to the clamp slide 27 andsuitable hooks or attaching devices on the bed plate 22 to move theslide inward. In this manner the single pair of springs serves both toclamp the lens in position between the pins 26 and 28 and at the sametime to move the entire lens carriage inward toward its innermost limitof movement.

To limit the inward movement of the lens carriage and lens under theinfluence of the spring or springs 29, there is secured to the standard2, a projecting bar, or the like, 30, bearing the contact shoe 31,having an arouate inner contacting face 32. This face is adapted toengage the beveled terminus of the adjustable stop bar 33, which ispreferably of dove tail form and is slidably engaged in the undercutgroove 34: formed in the carriage member 25, said stop member 33 havinga downwardly bent outer end 35 in which is rotatably but non-slidablymounted the adjusting screw 36 having the knurled head 38 which may beturned to adjust the stop member 33 in or out a desired amount. Themember 33 is provided with the lens rest 36 preferably in the form of aconical point and with-a plurality of graduations or suitabledesignations 37. In use the lens is suitably mounted between the pairsof pins 26 and 28 and resting upon the point. 36, the point 36 thenbeing adjusted in or. out to come beneath the exact point on the lens atwhich it is desired to formthe drilled aperture, one of the designations37 being adapted to aline with the edge of the lens and denote thenumber of millimeters or the like which the point is located inward ofthe edge of the lens, while as the distance from the beveled end of themember 33 to the point 36 is constant, the point is at all times inexact axial alinement with the drill and drill spindle 5, adjustment ofthe point relative to the lens, therefore, moving the lens carriage inor out against the tension of the springs 29 or else swinging thecarriage and yoke 17 outward together against the tension ofthe spring39 which normally swings the yoke toward the standard 2. The advantageof this construction should be at once apparent, in that it Wlll benoted the lens may be mountnaaepoa ed in the lens centering holder orclamp in the usual manner with the yoke swung outwardly on its pivot 18if desired and the point 36 then adjusted to lie under the exact pointat which it is desired to drill the lens, after which the entire devicemay be swung inward into operative position. It is also to be noted thaton account of the engagement of the trunnions 21 in the bearings of theyoke that by loosening of the clamp nut 23 the carriage may berotatively adjusted according to whether convex, concave or meniscussurfaces are to be drilled,the raised relation of the trunnion 21 to thebed plate and parts mounted on the bed being such that the apex of thelens support 36 projects substantially into the pivotal axis of theparts. The result of this is that the position of the point relative tothe axis of the drill is not varied by rotative adjustment of the lens,lens holder and supporting bed plate therefor, and consequently thepoint is at all times in and serves as an accurate gage for the positionof the lens irrespective of the other adjustments of the parts.

In connection with certain forms of mountings, or shapes of lenses, itsometimes proves desirable that the lens be drilled either above orbelow center. In the drawings I have shown two methods by which this maybe accomplished, the one consisting in pivotal adjustment of thecarriage base 10 and parts carried thereby, the eflect of thisadjustment being indicated by the scale 14 and indicator plate 13.

The preferred construction for attaining this result, however, has beenillustrated in connection with Figs. V and VI, by reference to which itwill be noted that the pins 28 are carried by the slide a0, movabletransversely of the lens clamp slide 27. "A blade spring member llsecured to the underside of the slide 40 exerts suflicient friction tolock'the'slide in any desired adjusted position, while sliding outwardto one side or the other serves to twist the lens and thus vary theportion of the lens which will lie directly over the point 36, or as itis commonly termed, to decenter the lens or position it for drillingabove or below center. Suitable designations 42 and registeringindication marks, pointer, or the like 43 on the clamp slide 27 andtransversed pin-bearing slide 40, together serve to indicate the amountof adjustment of the inner end of the lens produced by predeterminedamount of movement of the slide bar.

If preferred, however, in place of using the designations for thispurpose, a dot or the like may be laced on the lens at the exact pointat which it is desired to drill the same, the slide bar adjusted tillthe mark is in longitudinal alinement with the point 36 and the pointthe axis of the drill 3 36 then adjusted through rotation of the lens bylateral shiftin of the pins 28 till the point is beneath t e dot,whenthe machine will be foundto be set in correct position for theparticular drilling desired.

It will be noted that in Fig. V Ijhave illustrated a slightly difi'erentconstruction from that described in connection with Figs. I and II, inthat in place ofemploying the lens holder slide 25, the lens clam member27 slides directly on the-bed 22, w e the front pins 26 are likewisecarried directly by the bed in place of indirectly upon thelens carriageslide. The only diflerence in this instance is that adjustment of themember 33 against the contact shoe 31 swings the yoke 17 outward on itspivot 18 against the tension of the spring 39 or allows the spring todraw the yoke and thus the other parts inward in place of the movementbeing primarily imparted to the slide carriage as previously described.

In this connection attention is called to the a fact that the arcuatecontact surface 32 of the shoe is such as to compensate for thevariation in position of the end of the member 33 occasioned by rotativeadjustment of the parts about the trunnions 21 as a pivot center, to atall times maintain the apex of the supporting point 36 in axialalinement with the drill spindle and drill;

In Fig. VII I have shown a slight modification of the contact point inwhich in place of making the same a plain beveled edge I have mountedthe barrel shaped roller 44 on the end of the member 33, providing adevice which will have a little freer movement and will not have asgreat tendency to wear, while the contact shoe is likewise car rie' d bya sleeve 45, adapted to be locked in ad usted position by theset screw46, this adjustment serving as a take-up for any possible wear .of theparts in case of frequent adjustment for varying styles of lenses. Theparticular object of the barrel-shaped roller here referred to is in theevent of apivotal adjustment of the lens holder base 10 and partscarried thereby about. the lug 9, this.

barrel shape will compensate for the variation in position occasioned bythe swinging.

movement horizontally of the several parts, while the inclination andare of the arch 32 of the shoe 31 compensates for the tilting adjustmentof the lens holder itself.

From the foregoing description taken in connection with the accompanyingdrawings, the construction and operation of my improved drill should bereadily apparent, and 1t will be seen that I have provided an extremelysimple and desirable construction in 1 which the exact point at whichthe lens is to be drilled may be readily determined upon positioning ofthe lenswithin the holder, in

which a support for-the lens is positively said geometrical axis, andnear to or more distant from theedge of the lens as desired,

may be accomplished.

I claim:

1.- In a lens drill, the combination with a base and a standard risingtherefrom, of a drill operatively supported by the standard, astoprcarried by the standard, a lens holder movable toward the stop, andan adjustabledevice carried by the holder and I engaging the stop forregulating the p0sition of the'lens holder relative to the drill,substantially as illustrated.

, .2..'In a drill, the combination with a base and standard carriedthereby, of a drill operatively supported by the base, a yoke pivotallyconnected to the base, a lens holder carried by the yoke, means forswinging. the yoke toward the standard, a

stop carried by the standard, and means supported by the yoke andengaging the stop for limiting the movement of the yoke toward thestandard to control the position of a lens when within the holder.

3. In a lens drill, the combination with a base and a drill standardrising therefrom, of a lens holder mounted on the base for tiltingadjustment and for movement in direction of the standard, a curved stopcarried by the standard, and an adjustable contactmember on the lensholder adapted to engage the stop to limit the movement of the holder inthe direction of the standard, the. curvature of the stop being such asto compensate for the tilting movement of the holder to maintaintheholder a predetermined distancefrom the standard,

. irrespective of the tilting movement.

4. In a lens drill, the combination with a lens centering holder, of aslide movable relative to the holder, a lens supporting point carried bythe slide for adjustment relative to the holder, a drill support, andmeans on-the drill support engaging the slide to maintain the pointthereon 1n alinement with the drilling point of the drill.

5.'In a lens drill. the combination with a base of a standard carriedthereby, a drlll "point carried by the standard, a yoke pivoted to thebase and adapted, to be swung toward the standard, means for actuatlngthe yoke toward the standard, a, lens holder basal section having a pairof spaced pins,

a clamp section slidably mounted on the base section and having a secondpair of spaced pins, whereby said pins are adapted to engage the edge ofa lens at four points to center the same, and means on the clamp sectionfor laterally shifting its pair of pins with respect to those of thebasal section to vary the relation of the geometrical axes of the lensto the holder, substantially as for the purpose described.

7. In a lens drill, a drill, a contact shoe mounted adjacent to thedrill, and means for properly positioning a lens for thedrillingoperatlon, including a holder having a plurality of centeringpins for engaging the edge of the lens, certain of said pins beingmounted for lateral movements to vary the position of the lens, meanstiltingly supporting the holder to permit of adjustment of the holder tobring the surface of the lens normal to the drill, and a combinedindicating and stop device, carried by the holder, having an adjustablepoint adapted to be alined with the spot on the lens to be drilled andhaving a terminal contact portion adapted to engage said contact shoe toaid in controlling the position of the lens and holder relative to thedrill.

8. lln a lens drilling machine, the combination With a lens holdermovable toward and away from the drill, of a stationary contact shoe,and a stop carried by the holder for engagement with the shoe, said stophaving a point adapted to register with the portion of the lens to beoperated upon by the drill, and having designations indicating thedistance of the point from the edge of the lens, substantially asillustrated.

9. A lens drilling machine, including a support and a drilling membercarried by the support, a lens holder sup-port movable bodily toward andaway from the axis of the drill in a plane substantially normal thereto,a lens holder pivoted on said support for tilting movement in a plane atright'angles to the axis of the drill, an ad-. 'ustable lens supportingpoint on the holder aving its lens engaging point disposed in thetilting axis of the holder, means for adneeepoe justing the position ofthe point, including a suitable, shiftable support therefor, and meansengaging the support for the point to maintain the point in fixedrelation to the axis of the drill, irrespective of the tiltingadjustment of the lens holder.

10. In a lens drill, a lens holder having points engaging the edge ofthe lens to center the same, means for laterally shifting certain of thepoints to vary the position of the lens in the holder, a slideadjustable longitudinally of the holder, a lens supporting point carriedby the slide and adjustable therewith, whereby adjustment'of the slideand of the lens engaging pin will bring any desired point on the lensimmediately over the supporting point therefor, and means engaging theslide for controlling the position of the point relative to theremainder of the drill, regardless of its adjustment relative to thelens and lens holder.

ll. in a lens drill, the combination with a base and a drill supportedthereby of a yoke hinged to the base for swinging movement toward andaway from the axis of the drill, and a lens holder supported by theyokefor tilting movement relative to said axis.

12. In a lens drill, the combination with a base and a drill supportedthereby of a yoke hinged to the base for swinging movement toward andaway from the axis of the drill, and a lens holder supported by the yokefor tilting movement relative to said axis and means for locking theholder in desired tilted position in the yoke.

13. In a lens drill, the combination with a base of a yoke pivoted tothe base, a drill carried by the base, means for automatically swingingthe yoke toward the drill, and a lens holder supported by I the yoke andbrought into operative position by the movement of the yoke toward thedrill.

14. In a device of the character described, the combination with a bedplate, of a lens holder-mounted on the bed plate, a channel formed inthe bed plate, and a lens rest slidably mounted in the channel andprojecting upward therefrom to engage a lens, substantially as and forother purposes described.

15. A lens drill, including a base, a vertically disposed bracketpivoted at its lower end to the base and rising therefrom, ahorizontally disposed lens holder tiltably supported by the upperportion of the bracket, means for limiting the tilting of the holder ina horizontal plane and the swingingof the bracket in a vertical plane,and a lens drill supported by the base for operation on a lens heldwithin the holder.

16. lln a device of the character described, the combination with a baseand a drill standard rising therefrom, of a contact shoe adjustablysupported by the standard, a

, lens holder movable toward and away, from the shoe with respect to thestandard serves,

the shoe, said holder bearing a lens support- In testimony whereof aflixmy signature ing point and a terminus contact for engage in the presenceof two witnesses. ment with the shoe, whereby adjustment of O O tocontrol the position of the point with re- Witnesses; spect to the drillmounted on the standard, EDITH M. HALVORSEN, substantially asillustrated. 1 a G. F. FLOOD.

